Calculating-machine.



No. 741,961. PATENTED OUT. 20, 1903. H. E. GOLDBERG.

CALCULATING MACHINE.

APPLICATION I ILED JUNE 11. 1902.

10 MODEL. 14 SHEETS-SHEET 1.

No. 741,961. PATENTED 001?. 20, 1903. H. E. GOLDBERG.

CALCULATING MACHINE.

APPLICIATION FILED JUNE 11. 1902.

H0 MODEL. 14 SHEETS-SHEET 2.

PATENTED 001". 20, 1903.

H. E. GOLDBERG.

CALCULATING MACHINE.

APPLICATION FILED JUNE 11. 1902.

14 SHEETS-SHEET 3.

N0 IODEL.

PATENTED OCT. 20, 1903.

H. E. GOLDBERG. CALCULATING MACHINE.

APPLICATION PIL'ED JUNE 11. 1902.

N0 MODEL.

[my A No; 741,961. PATENTED 001?. 20, 1903. 11.. B" GOLDBERG CALCULATING MACHINE. APPLICIAIION FILED JUNE; 11. 1902. R0 MODEL. 14 SHEETS.SHEET 6.

No. 741,961. PATENTED OCT. 20, 1903. H. E. GOLDBERG. CALCULATING MACHINE.

APPLICATION FILED JUNE 11. 1902.

K0 MODEL. 14 SHEETS-SHEBT 6.

WWI/ W1- Zow 'No. 741,961. PATENTED OUT. 20, 1903. H. E. GOLDBERG.

CALCULATING MACHINE.

APPLICATION FILED JUNE 11 1902. N0 MODEL. 7 14 SHEETSS HBET 7.

Hull! mnml 'Hlllllllllllll "'11 muillllii 'll: i 4 HUIIIIHIII fllllllllllli Mllll I" n llllllllll ll PATENTED OUT. 20, 1903.

' H. E. GOLDBERG.

CALCULATING MACHINE.

APP LIOATION FILED JUNE 11. 1902.

14 SHEBTS-SHEBT B.

N0 MODEL.

No. 741,961. PATENTED OCT. 20, 1903.

11. B. GOLDBERG. I CALCULATING MACHINE-i APPLICATION FILED JUNE 11. 1902. H0 IODEL. 14 SHEETS-SHEET 9.

PATENTBD 001?. 20, 1903.

H. E. GOLDBERG CALCULATING-MACHINE.

I APPLICATION FILED JUNE 11. 1902.

N0 MODEL 14 sHHETssHnET 10.

mm, WASHINGYON n c No. 741,961. PATEN'TED OCT. 20, 1903. H. E. GOLDBERG. CALCULATING MACHINE.

APPLIGATION FILED JUNE 11. 1902.

N0 MODEL. 14 SHEETS-SHEET 11.

l ll ma NOHRIS warms co. PHmO-UTHQ. wAsumm' ooooo c.

No; 741,961. v r 'PATENTBD OCT. ,20, 1903'.

- H. E. GOLDBERG.

CALCULATING MACHINE.

APPLICATION FILED JUNE .11. 1902.

N0 MODEL. l4 SHEETSSHEET 151.

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' PATENTED OCT. 20, 1903. H. E. GOLDBERG.

CALCULATING MACHINE.

APPLICATION FILED JUNE 11. 1902.

N0 MODEL. 14 SHEETSSHEET 13.

ilmmni No. 741,961. *TPATENTED 001?. 20, 1903.

H. E. GOLDBERG. CALCULATING MACHINE.

APPLIUATIOK FILED JUNE 11. 1902 H0 MODEL. 14 SHEETSSHEET 14.

UNITED STATES Patented October 20, 1903.

IIYMAN ELI GOLDBERG, on cinoAGo, numnois.

CALCULATlNG-MACHINE.

SPECIFICATION forming part Of Letters Patent N 0. 741,961, dated October 20, 1903.

' Application filed June 11,1902- Serial No. 111,141. (No model.)

To It whom it TIMLZ/ concern:

Beit known that I, HYMAN ELI GOLDBERG, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented new and useful Improvements in Calculating-Machines,of which the following is a specification.

My invention relates to calculatingmachines, and is shown in a form adapted for attachment to a type-writer.

Mypresent machine embodies certain improvements over the machine described and claimed by me in an application filed in the United States Patent Office February 24,1002, Serial No. 95,342, issued October 7, 1902, as Patent No. 710,772. It is also related to an earlier United States application, filed September 26, 1001, Serial No. 76,680, issued November 4, 1902, as Patent No. 712,518.

The objects of the present invention are, first, to provide means whereby the calculating parts of the machine may be readily thrown into or out of operative engagement with the figure-keys; second, to provide a positive-geared connection between the digitlevers and the mechanism operated by said levers for shifting the master-pinion out of mesh with the part which rotates said pinion; third, to effectually eliminate the danger of overthrow and also the effect of backlash by an improved locking and correcting mechanism; fourth, to facilitate the reversing of the mechanism to change from addition to subtraction, or vice versa, by the lateral shifting of a single narrow-faced pinion; fifth, to increase the range of adjustment of the calculable column of figures on the page; sixth, to provide an auxiliary locking device operative upon the receiving mechanism; seventh, to provide means for supplementing the action of the controlling-bar cams, so that said cams may not impede the travel of the carriage; eighth, to facilitate the calculating of a plurality of columns of figures, and, ninth, to provide means for indicating to the operator when erasing or printing the total what figure-wheel should next be operated upon.

This avoids the necessity of examining the printed page. These objects are accomplished by the mechanism illustrated in the accompanying drawings, in which- F gure 1 is afront View of the machine in closed within the outer casings thereof and shown in position upon a type-writer. Fig. 2 is a general sectional view looking in the direction of the arrows on the line A A, Fig. 1. Fig. 3 is a sectional view taken in the direction of the arrows on the irregular line B B, Fig. 1. Fig. 4 is a plan view of the rockshafts and connected parts of the concentrat ing mechanism. Fig. 5 is a sectional View taken transversely to the rock-shafts, illustrating the operation of the digit-levers and connected parts. Fig. 6 is a front view of the digit-levers. Fig. 7 is a front view of the slide which carries the receiving mechanism. Fig. 8 is a sectional View looking in the direction of the arrows on the line C C, Fig. 7. Fig. 9 is a sectional view of the slide. Figs. 10, 11, 12, and 13 are diagrammatic views illustrating the operation of the digit-levers and connected parts. Fig. 11 is a front view of the setting and reversing mechanism. Figs. 15 and 16 are front views of the reversing mechanism, showing the two different positions thereof. Fig. 17 is a sectional view on the line D D, Fig. 15. Fig. 18 isa fragmentary view of the reversing-bar. Fig. 19 is a rear view of the setting and reversing mechanism. Figs. 20 and 21 are plan views illustrating the operation of the cams for shifting the masterpinion. Fig. 22 is a face view, and Figs. 23 and 24 are opposite side views, of the inshifting-cam operative upon the master-pinion. Fig. 25 is a face view of the oscillating gear wheel which drives the master-pinion. Fig. 26 is a side view of the outshifting'cam for shifting the master-pinion. Fig. 27 is a sectional view on the line E E, Fig. 20. Fig. 28 is a plan view showing the valuating mechanism and reversing mechanism. Figs. 29 and 30 are plan views from the rear, showing the operation of the disconnecting device whereby the. calculating-machine may be thrown into and out of operative connection with the type-writer. Figs. 31 and 32 are edge and side views, respectively, of the yoke for connecting the two disconnecting-arbors. Figs. 33 and 31 are edge and side views, respectively, of the gear-wheel on the outshifting-cam arbor, showing the stop-pin thereon. Figs.

and 36 are front and side views, respectively, of the locking device operative upon the setting-wheel. Figs. 37 and 38 are diagrammatic ICO side views illustrating the operation of the locking device shown in Figs. 35 and 36. Fig. 39 is a fragmentary View of one of the side plates of the machine,showing the spring for retaining the disconnecting device in its shifted position. Figs. 40, 4:1, and 42 are front, rear, and top views, respectively, of the carrying mechanism. Figs. 43 and 44 are sectional views of the carrying mechanism, illustrating the operation of the rocking frames. Figs. L5 and 46 are sectional views of the carrying mechanism looking in opposite directions. Fig. 47 is a face view of the auxiliary locking device operative upon the rocking frames of the carrying mechanism. Fig. 48 is a sectional detail view of the detent for retaining the carrying mechanism in the proper position upon the slide-bar. Figs. 40, 50, and 51 are different views of the periphery of a carrying-wheel. Fig. 52 is a side view of the carrying-wheel looking in the direction of the arrow, Fig. 46). Fig. 53 is a side view of a single cam-section of a carrying-wheel, and Fig. 54 is a side view of two cam-sections of said Wheel, showing the manner in which they combine to form in this instance two overlapping carrying-teeth one hundred and eighty degrees apart. Figs. 55 and 56 are side views of the carrying wheels and pinions, illustrating the cooperation thereof. Fig. 57 is a face view of the carrying-wheels and pinions, showing the relative positions thereof. Fig. 58 is a face view of a carrying-pinion. Figs. 59, 60, and (31 are sectional views of a carrying-pinion looking in the direction of the arrows on the lines F F, G G, and H H, respectively, Fig. 58. Fig. (32 is a view showing the manner of disconnecting the shift-pinions from the digit-levers. Fig. 63 is a fragmentary view of the disconnecting mechanism. Figs. (it and 65 are sectional views illustrating the operation of the auxiliary locking mechanism operative upon the rocking frames. Fig.

6G is a front view of part of the controllingbar. Figs. (57 and 68 are side and edge views of a figurewheel. Fig. 69 is a detail view showing the correlation of the cams which operate against the collar for shifting the n'iaster-pinion. Fig. 70 is a sectional view of the carrying mechanism, taken on the lin e 70 70, Fig. 40, and shows the extra carryingpinion, which is fixed in its rocking frame so as to act as a lock or detent for preventing the unwarranted rotation of the units carrying-wheel. Fig. 71 is the same as Fig. 70, except that the detent for the extra carrying-wheel instead of being formed of a carryingwheel fixed in its rocking frame is shown in the form of a catch or finger formed integral with the rocking frame at the extremity thereof.

Similar numerals refer to similar parts throughout the several views.

For convenience the machine will be considered under the following general headings, to wit: The concentrating mechanism,

which includes the key-action and connected parts for driving the digitlevers; The valuating mechanism, which transmits motion from the digitlevers to the masterpinion; The shifting mechanism, for c011- trolling the lateral position of the masterpinion; The disconnecting mechanism, for throwing the calculating parts into and out of operative connection with the type-writer; The reversing mechanism, which transmits the motion from the master-pinion to the setting-wheel and determines in which direc tion the settingwheel shall rotate; The locking mechanism, for preventing accidental rotation of the setting-wheel and neutralizing the effect of backlash; The receiving mechanism, whereby the action of the setting wheel controls the iigure wheels; The tens-carrying mechanism, which forms a part of the receiving mechanism and operates to carry the tens to the figure-wheels after they have passed the setting-Wheel; The controlling mechanism, operative upon the carrying mechanism and the slide whereon the carrying mechanism is carried.

In the typewriter, 1 represents the framework; 2, the laterally-movable carriage; 3, the type-writer keys, and 4 the spaeing-bar.

The concentrating mechanism.The keyriders 5 are secured to the shanks of such of the keys 3 as represent numerals, and said riders are pivotally connected to the bellerank levers 6 by means of the links 7, as best shown in Fig. 2. Said crank-levers are provided with a series of apertures for receiving and engaging the upper extremities of said links to provide for adjustment between said levers and the keys The base-plate S of the calculating mechanism is rigidly secured to the typewriter frame and carries the lugs 0, which form bearings for the rock-shaftslO of the concentrating mechanism. The said lugs also form bearings for the fulcru m-shai't l. l. Said cranklevers 6 are loosely mounted on said fulcrumshaft, so as to be independently revoluble, but laterally non shiftable thereon. The links 12 are connected at one extremity to said crank-levers 6 and at the 01 her extremity to the rock-shaft arms 13. Said rock-shaft arms are rigidly fastened to the rock-shafts 10, and the parts are therefore so arranged that the depression of one of the figure-keys 3 of the type-writer causes the rotation of the respective crank-lever 6 upon the fulcrumshaft 11 and the consequent rotation of the respective rock-shaft 10. In the present instance the operative rock-shafts 10 are nine in number, an idle tenth shaft being placed in the mechanism for the sake of symmetry and uniformity in manufacture. Said shafts are arranged in two groups of live each, each shaft having an independent bearing in the center one of the lugs 9 and one of the side lugs 9. Near said center lug each operative rock-shaft 10 carries a rigidly-set digit-lever arm 14-, and said arms are connected to their respective digit-levers by means of the links 16.

The tolerating mechcmz'sm.-Said digit-levers 15 are loosely mounted on the fulcrumshaft 17 and prevented from moving laterally thereon by means of the hubs of said levers. Said shaft is rigidly supported in the center one of the lugs O and also passes through the plates 18, which form side walls for the machine. Said levers-15 extend in two directions from said shaft 17, one arm being connected to the links 16, as described, and the other arm carrying a pin 19 for actuating the digit-sectors 20. The throw of said levers 15 in one direction is limited by the bar 21 and in the other direction by the bar 22, fixed in the side walls 18. The sectors are loosely mounted upon the fulcrumshaft 23, which is fixed in the side walls 18, said sectors being prevented from moving laterally upon said shaft by means of their hubs and by means of suitable spacing-collars 23 or in any other suitable manner. Said sectors are nine in number, one for each of said levers 13. Said sectors are provided with two connecting cam-surfaces 24c and 25. Said surface 2 1, which forms a slot in said sectors, constitutes a doublecam and extends approximately radially, so that when the parts are in normal position, as shown in Fig. 10, said sectors are locked by said pins 19. The cam-surface 25 conforms to the arc of a circle and is so placed that when a sector is in the position shown in Figs. 12 and 13 the center of curvature of said cam-surface is coincident with the center of the shaft 1'7. The bars 26 and 27 are fixed inthe side walls 18 and form stops for limiting the rotation of said sectors 20. The parts are so arranged that when in normal position the sectors '20 are in proximity to the stop-bar 26, the levers 15 are in proximity to the stop-bar 21, and the pins 19 are adjacent to the cam-surfaces 24, all substantially as shown in Fig. 10. The first part of the downward stroke of the type-writer key causes the pin 19 to travel along the cam 24:, first moving inward toward the center of the sector 20, as shown in Fig. 11, and sub sequently moving outward to the end of said cam, as shown in Fig. 12. When said pin has reached the end of said cam 23, the further rotation of said sector is prevented by the stop-bar 27. At this stage, however, the pin 19 has reached the beginning of the cam 25, which nowlies concentric with the path of rotation of said pin. Said pin may therefore continue to move, for example, to the position shown in Fig. 13, so that the throw of the type-writer key is not limited by the digit sectors 20, but said sector remains locked by .said pin 19 until during the return stroke of the type-writer key said pin again reaches the cam 24. By preference said sectors 20 are all of the same general outline and have the same amount of rotation and differ only in the number of teeth with which said sectors are provided. The digit-sector cor responding to the digit 0 has the highest number of teeth, the sector corresponding to the digit 3 has one tooth less, the sector corresponding to the digit '7 has two teeth lessthan the sector for 9,and soon. These gear-teeth 28 are for the purpose of rotating the digit-pinions 29, which are rigidly fixed upon the pinion-arbor 30. Consequently the amount of rotation of said bar depends 011 the number of gear-teeth 28 on the temporarily-acting digit-sector. The amount of rotation of the digit-pinion arbor is therefore greatest for the digit 9, is one step less for the digit 8, isanother step less for the digit 7, and least of all for the digit 1. There are nine digit-pinions upon said pinion-arbor, one for each digit-sector, as best shown in Figs. 29 and 30. The mutilated gear-wheel 31, which is rigidly set upon the shaft 32, is always in mesh with one of said pinions, and the backward-and-forward rotation of said pinions causes a corresponding back ward-and-forward rotation or oscillation of said gear-wheel 31. The master-pinion 33, mounted upon the shaft 34:, is both revoluble and laterallyshiftable. The shifting of said shaft 34 throws the master-pinion into and out of mesh with said mutilated wheel 31, the object in shifting the master-pinion out of mesh with said mutilated wheel being to permit said mutilated wheel to rotate backward to its initial position without rotating the master-pinion in a backward direction. Said master-pinion rotates in only one direction and does not have a backward-and-forward rotation, as does the mutilated wheel 31.

As illustrated in Fig. 10, the digit-sectors 20 are normally out of mesh with the digitpinions 29, and in order to prevent accidental rotation of said pinions and gear-wheel 31 at such times a spring 35 is provided, as shown in Figs. 20 and 21. In the arrangement shown the spring is wound around the shaft 32, one end being secured to said shaft and the other end to the adjacent side wall 18. A stop-pin 36 is set in the side of the gear-wheel 31 and is adapted to strike a similar pin 37, set in the adjacent side wall. (See Figs. 20, 21, and 25.) Said stop-pins prevent the rotation of the gear-wheel in one direction, and said spring 35 yieldingly holds said pins in contact, thereby preventing accidental rotation of said wheel 31.

The shifting meclumtsm.When the machine is in normal position and the typewriter keys are up, the master-pinion is in meshwith the mutilated gear-wheel 31. The devices for shifting the master-pinion out of mesh with said mutilated wheel will now be considered.

Referring especially to Figs. and 12, the digit-levers 15 are shown to be provided with toothed segments 38 at their extremities, which mesh with the shiftpinions 39. Said pinions are rigidly set upon the shift-pinion arbor 1O and are nine in number, corresponding to the number of digit-levers. One of the pinions 3!) meshes at all times with the gear-wheel 41, which is rigidly fixed on the shaft 42, as best shown in Fig. 62. In order to prevent accidental rotation of the shaft 42, the spring 43 is provided, one extremity being secured to said shaft and the other extremity to one of the side walls 13. The pin 44 is set in the side of the wheel 41 and is adapted to strike against the pin 45 in the side wall 18, thereby limiting the amount of rotation due to said spring. The cam 46 is rigidly fixed on the same shaft 42 whereon the wheel 41 is fixed. Said cam has a beveled portion 47, adapted to contact the col 1ar48. (See Figs. 20 and 21.) Said collar is rigidly fixed upon the shaft 34, which carries the shiftable master-pinion 33, and the parts are so arranged that the rotation of the shaft 32 and cam 46 will shift said pinion out of mesh with its mutilated driving-wheel 31. This action is illustrated in Figs. 20 and 21, Fig. 20 showing the normal or initial position in which the master-pinion is in mesh with wheel 31, and Fig. 21 the shifted position in which the pinion is out of mesh therewith.

It is evident by referring to Fig. 3 and Figs. 10 to 13 that the segments 38 on the digit-levers 15 do not engage the pinions 39 until near the completion of the forward motion of the digit-sectors 20. The mechanism is so timed that the cam 47 does not operate upon the collar 48 until after the completion of the forward motion of the sectors 20, and the master-pinion 33 will therefore not be shifted out of mesh until it has completed its rotary motion. The rotarymotion and the lateral shifting of the master-pinion occur on the downward stroke of the type-writer key, and consequently if the type-writer key has not been depressed sufficiently far the cam 47 will not have acted upon collar 48 and the master-pinion 33 will not have been shifted out of mesh with wheel 31. Consequently on the upstroke of the type-writer key both wheel 31 and master-pinion 33 will rotate back to their former positions without having produced any effect upon the remainder of the mechanism. Thus the depression of a type-writer key results in either the setting up of the proper digit or else has no effect at all. The device for shifting the master-pinion back into mesh with the wheel 31 comprises the cam 50, which is rigidly set on the shaft 32, the same shaft which is rotated by the mutilated gear-wheel 31. Said cam has a beveled portion 51, which when the cam is rotated comes into contact with the collar 48 and shifts the pinion back into mesh with said mutilated gear-wheel. Said beveled portion 51 is so timed as to operate near the end of the upstroke of the type-writer key, so that the master-pinion may be in mesh in readiness to be driven when the next key is struck. In order that the wheel 31 shall not interfere with the master-pinion while the latter is being shifted to a position to mesh with said wheel 31, said wheel has a portion 52 of its toothed face cut away. This mutilation of wheel 31 to produce the non-interference space 52 is illustrated in Figs. 21 and 25. Of course this mutilation of the wheel 31 results in a lost motion at the beginning of the forward stroke of said wheel-that is to say, there will be no rotation of the master-pinion until the wheel 31 has rotated forward an amount equal to the space from which the teeth have been cut. Due allowance is made for such lost motion-for example, if three teeth are cut away from the wheel 31 as being necessary for the action of the cam to shift the master-pinion into mesh then the wheel 31 rotates a space of three more teeth than is required of the master-pinion in the setting up of any given digit. In operation therefore the wheel 31 rotates backward and "forward, while the master-pinion rotates only forward, and the forward and also the backward rotation of wheel 31 always exceeds the rotation of the master-pinion by an amount equal to the non-interference space on said wheel 31.

The disconnecting mechanism-It is desirable that the calculating parts of the machine may be readily thrown out of connection with the type-writing parts when no numerical calculations are required. The devices for attaining this object will now be described.

Referring to Figs. 29, 30, 62, and 63, the arbors 30 and 40, bearing, respectively, the digit-pinions 29 and shift-pinions 39, are not only revoluble, but are laterally shiftable. There is a space between each two adjacent pinions on said arbors, so that when said arbors are shifted the pinions 29 will all stand aside out of mesh with their respective digitsectors 20, as illustrated in Fig. 30, and in a similar manner the pinions 39 will stand aside out of mesh with their digit-levers 15. The shifting of said arbors is accomplished by means of the disconnectingbar 53. Said bar is laterally shiftable and is connected to the arbors 30 and 40 through the yoke 54. (See Figs. 32 and 63.) The yoke is rigidly fixed on the bar 53 and straddles said arbors between the collars 55 on the arbor 30 and collars 56 on the arbor 40. Said collars do not bind the yoke, and as a result the yoke controls said arbors laterally, but does not prevent their free rotation. In order to retain the pinion-arbors 30 and 40 in either of the shifted positions, two notches 57 (see Fig. 31) are out upon the bar 53, and a spring 58, fastened to the adjacent side wall 18, snaps into one of said notches. This disconnecting device is an important feature of the machine, because by simply pressing the buttons 5.) with which the disconnecting-bar 53 is provided the pinions 29 and 39 may be shifted into or out of operative position, and when said pinions are out of operative position the depression of a type-writer key will have no effect upon the calculating mechanism. The digit levers and sectors will oscillate in re sponse to the action of their respective keys TIC ' but laterally fixed.

but will transmit no motion to the other parts of the machine.

The reversing mechanism.-It has been above stated that the shiftable master-pinion 33 always rotates in the same direction; but in order that the calculating-machine maybe capable of performing both addition and sub traction means are provided for reversing the effect of the master-pinion upon the carrying mechanism. Briefly stated, this is accomplished by varying from odd to even, or vice versa,the number of gear-wheels actively interposed at any. given time between the master-pinion and the carrying mechanism. The device here employed for this purpose is best shown in Figs. to 18. The gear-wheel 62 is rigidly set upon the revolnble and laterallyshiftable shaft 61. Said wheel is so placed and the master-pinion 33 is of such width that said wheel and pinion are at all times in mesh. A gear-wheel 63 is mounted upon the shaft 64 in such a'manneras toberevoluble, The location of said wheel 63 is such that when the wheel 62 is in one shifted position wheels 62 and 63 arein mesh and when wheel 62 is in the other shifted position wheels 62 and 63 are out of mesh.

' The two wheels 65 and 66 are both rigidly mounted on the revoluble but laterally-fixed shaft 67. Vheel 65 is at all times in mesh with wheel 63. The wheel 62 may be shifted to be in mesh with either Wheel 63 or wheel 66. The setting-wheel 68, which is mounted upon the shaft 69 in'such a manner as to be revoluble,butlaterallyfixed, is always in mesh with the laterally-fixed Wheel 63. In operation the master-pinion 33 drives the wheel 62, and. the wheel 62 drives either the wheel 63 or 66, depending upon the shifted position of wheel 62. Now if Wheel 62 is in mesh with 63 then 63 will rotate in one direction; but if Wheel 62 is in mesh with wheel 66 then 63 will be driven by the wheel 65, and consequently will rotate in the opposite direction. In other words, if wheel 63 is driven directly by wheel 62 it Will rotate in one direction; but if wheels 65 and 66, which rotate as a single piece and virtually constitute a single wheel, are interposed then 63 will rotate in the opposite direction. Thus the lateral position of the shiftahle wheel 62 determines the direction of rotation of the wheel 63, and consequently of the setting-wheel 68. It will be understood that Wheels 65 and 66 rotate whenever wheel 63 rotates; but when 62 is in mesh with 63 then 65 and 66 will rotate idly and will have no effect upon any part of the mechanism. The shifting of the wheel 62 reverses the direction of rotation of the setting-wheel 68, and therefore determines whether the machine shall add or subtract. Such shifting is necessary only when it is desired to change from addition to subtraction, or vice versa, and such shifting is done by hand by means of the following; devices.

Referring to Figs. 15 and 16, the reversingbar 70 is mounted in the side walls 18, so as to be laterally shiftable, and the push-buttons 71 on the outside of said walls serve as stops to limit the shifting of said bar. The yoke 72 is rigidly secured to said reversingbar and straddles the shaft 61 between the collars 73. Said collars are rigidly set upon said shaft 61, but do not bind the yoke, so that said shaft is free to revolve, but is controlled in its lateral position by the bar 70. In order to retain the reversing-bar in either of its shifted positions, two notches 74 (see Figs 17 and 18) are cut therein, and one portion of the spring 58 (shown in Figs. 3 and 39) snaps into one of said notches. Thus bysimply pressing one of the buttons 71 the machine may be changed from an adding to a subtracting machine, or vice versa.

The lock mg mechanism.--Although the master-pinion and setting-wheel are always in gear with each other, there are several wheels interposed between them, and in order to overcome the effect of excessive play or backlash a locking mechanism is provided. This locking, mechanism consists of the rockshaft 75 and the arms rigidly carried thereon. (Best shown in Figs. 35 to 38.) The lockingarm 76 on said shaft has its outer extremity adapted to enter between the teeth of the master-pinion 33, and in a similar manner the arm 77 is adapted to engage the setting-wheel 68. The outer extremities of said lockingarms are wedge-shaped and in moving into engagement with their respective wheels come obliquely into contact with the teeth thereon, thereby tending to force the wheels slightly ahead or backward in case said wheels have not been rotated to exactly the right position. After said wedge-shaped extremities have entered between the teeth the wheels become locked. Thus the locking mechanism has the double function of correcting the wheels and locking them. Said locking-arms 76 and 77 are normally held out of engagement with the master-pinion and setting-wheel by means of the spring 77. (Shown in Fig. 3.) In order to prevent the lockingarms from being withdrawn too far, the arm 78 is secured to said shaft 75 in such a position as to strike against the pin 79, set in the adjacent side wall, as shown in Fig. 35. The rock-shaft 75 is operated to throw the arms 76 and 77into mesh with their respective wheels by means of the arms 80 and 81, operated by the cams a6 and 50, respectively. Said cams have double functionsthat is to say, each has two working faces, one for shifting the master-pinion 33 in the manner previously described and one for operating its respective arms. The pinion 33 and wheel 68 are unlocked only when the cams 46 and 50 release their respective arms 80 and S1. The parts are so timed that when the machine is in normal condition or at rest the cam 50 is in contact against the arm 81 and holds the locking-arms in locked position. When the type-writer key is struck, the cam 50 is the first to rotate, and it releases its arm in time to permit the driving of the wheels and 68. After said wheels have completed their rotation, the cam 40, which has heretofore been out of contact with the arm 80, now comes into contact therewith and throws the locking-arms back into contact with their Wheels, thereby correcting and locking the same. The said Wheels are thus unlocked just before they are to be rotated and relocked just after they have completed their rotation.

The receiving mechanisntlhe receiving mechanism (shown separately in Figs. 40 to 46) is not attached to the stationary side walls 18, but is independent thereof, being mounted in a separate laterally-shiftable frame which in the present machine is located above the working parts hereinabove described. The side walls 82 of the carrying mechanism are mounted, by means of the lugs 82, so as to slide laterally with the motion of the type-writer carriage. The receiving-wheels 83 are loosely mounted on the shaft 84, which is fixed in the side walls of the carrying mechanism. Said receivingwheels are free to rotate upon said shaft, but are prevented from moving laterally thereon and are placed equidistant from each other, their distance apart being equal to one complete step of the type-writer carriage. The receiving-Wheels are so placed that they will be brought into mesh with the setting-wheel 68 one after the other-that is to say, the escapement of the type-writer carriage one full type-space will bring the next adjacent receiving-wheel into mesh with said settingwheel. The number of receiving-wheels is equal to the number of figure-wheels of the mechanism and determines the value of the highest number which can be shown on the machine. The wheels 83 mesh with the gearwheels 85, one of said wheels 85 being secured to each of the figure-wheels 86 for rotating the latter. Said figure-wheels (shown separately in Figs. 67 and 68) are loosely mounted on the shaft 87, but are prevented from sliding laterally thereon. Said figurewheels carry on their periphery a series of numerals or digits for registering in the manner common to calculating-machines. In the present machine each figure-wheel has ten figures, and each gear-wheel 85 has ten teeth.

As above stated, the receiving mechanism moves with the type-writer carriage, and the movement of the carriage is from left to right looking at the front of the type-writer, as in Fig. 1.

In order that each receiving-wheel 83 may be locked prior to the time when it comes into mesh with the setting-Wheel 68, a fin 88 is provided'on the stationary plate 89, as best shown in Fig. 1. Said fin engages the teeth of said receiving-wheels and locks the same during the time when said wheels are opposite said fin. Said fin lies to the right of the position occupied by the setting-wheel 68 and terminates at a point such that any given receiving-wheel is released from said fin just before coming into mesh with said settingwheel. By this construction the receivingwheels are locked by said fin until they are engaged by said setting-wheel. In order to eliminate the effect of looseness or backlash in the gearing and to complete the effect of the said wheel 68, said receiving-wheels are alined or corrected afterleaving said settingwheel by means of the pin 90, which engages said receiving-wheels momentarily as they leave said setting-wheel. Said pin 90 extends only a short length, so that one receivingwheel is disengaged therefrom by the time the next succeeding receivingwheel is in mesh with the setting-wheel.

The tens-carrying mechanism for transmitting the proper rotation to the figure-wheels after they have passed the setting-wheel 68 will now be described. In this mechanism the carrying-wheels, carrying-pinions, and rocking frames are practically the same as shown in the application above mentioned, filed February 24, 1902, Serial No. 95,342. Each receiving-wheel 83 meshes with its respective carrying-wheel 9t. Said carryingwheels are loosely mounted upon the shaft 92,butarelaterallyimmovablethereon. Said shaft is rigidly supported in the walls 82. Said carrying-wheels (shown separately in Fig. 49 and adjacent figures) are composed of three sections 93, 9t, and 95, which may be cut from a single block or formed separately and afterward secured together to act as a single piece. Looking from the front, as in Fig. et9, the section 93 lies upon the right and consists of a complete toothed gearwheel. The n u mberof teeth on said section 93 is a multiple of twenty, the present wheel having twenty teeth. The section 95 at theleft is a counterpart of the section 9% in the middle and consists of a disk having a circular periphery divided into two parts of different diameter. The portion of greater diameter corresponds to the point-circle and the portion of smaller diameter corresponds to the root-circle of a toothed gear-wheel. The point-circle portion of each of said disks exceeds a semicireumference by the space of one tooth, and said sections 9% and 95 are so arranged in the carrying-wheel that said point-circle portions overlap each other an area equal to two teeth. These overlapping areas constitute carrying-teeth and are located one hundred and eighty degrees apart, as shown, for example, in Figs. 5-1- to 56. The tens-carrying pinions 96 (shown in Figs. 58 to 61) are also formed in three sections 97, 98, and 99, acting as a single piece. Looking from the front the section 97 is located at the left and consists of a complete toothed gear having an even number of teeth, the present number being eight. Section 99 on the right is a counterpart of section 98 in the middle, which is a gear-wheel like the wheel 97, except that each alternate tooth is lacking. In the present machine each of the sections 98 and 99 have four teeth like those 

